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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2020
Postemployment Benefits [Abstract]  
Summary of Workers' Compensation Known Claims and IBNR Reserves Workers’ compensation known claims and IBNR reserves included on the Consolidated Balance Sheets were as follows (in thousands):
As of December 31,
20202019
Included in other current liabilities$7,703 $6,777 
Included in other long-term liabilities11,98610,874
$19,689 $17,651 
Schedule of Insurance Receivable for Claims This receivable offsets an equal liability included within the reserve amounts noted above and was as follows (in thousands):
As of December 31,
20202019
Included in other non-current assets$1,854 $2,098 
Contributions to Multiemployer Pensions and Health and Welfare Benefit Plans
Our contributions to multiemployer pension and health and welfare benefit plans were as follows (in thousands):
Years ended December 31,
202020192018
Pension plans$1,128 $809 $871 
Health & welfare plans952674724
Total contributions$2,080 $1,483 $1,595 
Summary of Equity-Based Awards for Employees
Amounts and changes for each category of equity-based award were as follows:
Common Stock AwardsPerformance-Based Stock AwardsPerformance-Based Restricted Stock Units
AwardsWeighted Average Grant Date Fair Value Per ShareAwardsWeighted Average Grant Date Fair Value Per ShareUnitsWeighted Average Grant Date Fair Value Per Share
Nonvested awards/units at December 31, 2019152,882 $52.93 160,289 $50.49 13,186 $51.62 
Granted174,445 44.56 61,174 77.20 13,655 36.51 
Vested(90,870)49.69 (54,502)51.43 (13,077)51.50 
Forfeited/Cancelled(5,177)45.94 — — (491)42.94 
Nonvested awards/units at December 31, 2020231,280 $48.05 166,961 $59.97 13,273 $36.51 
Summary of Stock Compensation Expenses
The following table summarizes the share-based compensation expense recognized under our 2014 Omnibus Incentive Plan (in thousands):

Years ended December 31,
202020192018
Common Stock Awards$4,116 $4,242 $3,847 
Non-Employee Common Stock Awards333 359 177 
Performance-Based Stock Awards3,869 3,034 2,041 
Liability Performance-Based Stock Awards1,969 432 163 
Performance-Based Restricted Stock Units539 660 1,618 
$10,826 $8,727 $7,846 

We recorded the following stock compensation expense, by income statement category (in thousands):

Years ended December 31,
202020192018
Cost of sales$284 $374 $846 
Selling202 194 451 
Administrative10,340 8,159 6,549 
$10,826 $8,727 $7,846 
Unrecognized Share-Based Compensation Expense Related to Unvested Awards
Unrecognized share-based compensation expense related to unvested awards was as follows (in thousands):

As of December 31, 2020
Unrecognized
Compensation Expense
on Unvested Awards		Weighted Average
Remaining
Vesting Period
Common Stock Awards$7,162 1.9 years
Performance-Based Stock Awards4,310 1.6 years
Performance-Based Restricted Stock Units137 0.3 years
Total unrecognized compensation expense related to unvested awards$11,609